Joutseno mill is celebrating its centenary. The mill was founded on 18th of January 1908 after the financial department of the imperial senate of Finland decided to approve Osakeyhtiö Pulp's (Pulp Ltd) Articles of Association. The mill was founded by a Norwegian construction engineer Johan Christoffer Wiese, and started its operations in May 1909. At that time the capacity of the mill was 6 000 tons unbleached pulp per year. Today Joutseno mill produces annually 645 000 tons of ECF bleached softwood pulp. The mill is the world's biggest producer of bleached softwood pulp with one production line. In total, it has produced over 13.5 million tons of pulp.